Anybody know what a "frustum" is and if it ever appeared on or as a part of the Model T?
Wheel bearing races come to mind.
"Frustum" as far as a Motel T part would or could be, is the shim on the rear axle.
Sorry, when I say shim, I mean the spacer shim to space the hub out, Frustum, a cone with the top cut off.
noun ( pl. -ta or -tums ) Geometry
the portion of a cone or pyramid that remains after its upper part has been cut off by a plane parallel to its base, or that is intercepted between two such planes.
"Frustum" is Latin and means: "what is left over"
In Geometry it is the part that is "left over" when cutting a cone or a pyramid.
In landscape it is "what is left over" after erosion by weather and climate.
For us, people, it is "what is left over" after a big frustration a deception.
This is what I remember of my school time some 50 years ago.
Yep, a cone, the axle/hub shim, any other thoughts on T parts?
The term Frustum is in fact used to describe the formation of the front cross member of the frame around the 9/16 square hole. The hole is supposed to be in a pocket area that is shaped like a Frustum. The exact wording of the 1915 version of the front cross member Ford drawing that I was looking at shows a leader pointing to the 9/16 square spring center bolt hole that reads "Pocket to be Frustum of a Pyramid" So they were assuming you were using a pyramid to envision how to shape it. Maybe somebody in Egypt can provide us a better idea of what that should be There are a number of shaping dimensional details but in truth it looks like you could just hit it with a big hammer to create a 1/8" deep pocket and it would be "close enough"
That makes sense John, a smack with a spike and the end result would be a Pyramid Frustum.